Public water system · LA1029006
ActiveLake St John Waterworks District 1
At a glance
Lake St John Waterworks District 1 (PWSID LA1029006) is an active community water system in Concordia Parish County, Louisiana. It reports serving 2,067 people through 689 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in October 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
2,067
Service connections
689
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Lake St John Waterworks District 1 compare with other water systems in Concordia Parish County?
By EPA's size categories, Lake St John Waterworks District 1 is a small system (501 to 3,300 people). Concordia Parish County has 8 active public water systems, and Lake St John Waterworks District 1 is the 5th-largest of them by population served. Its population served is about 36% below the county average of 3,231 people per system, and accounts for 8% of the 25,845 people reported by systems filed under the county. Across Louisiana, the 1,121 active systems average 4,685 people each. Nationally, the average active community water system reports serving 6,703 people, so Lake St John Waterworks District 1 is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Louisiana has 815 active community water systems, 73% of the state's 1,121 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 966 Louisiana systems (86%) list groundwater as their primary source.
Who owns and regulates Lake St John Waterworks District 1?
EPA lists Lake St John Waterworks District 1 as owned by a local government. The LA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 6 of the 8 active systems in Concordia Parish County (75%) are also owned by a local government.
Does Lake St John Waterworks District 1 have drinking water violations?
Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in October 2023. The violations listed here began between January 2022 and October 2023. By type: 11 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Haloacetic acids (HAA5) (6 of them). EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2023-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2023-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2023-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2023-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2023-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2023-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2022-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2022-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2022-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2022-05-04 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2022-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2022-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
The 12 most recent violations in EPA's records, newest first. Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Lake St John Waterworks District 1: frequently asked questions
Who runs Lake St John Waterworks District 1?
Lake St John Waterworks District 1 (PWSID LA1029006) is a community water system owned by a local government. It is regulated by the LA state drinking water program.
How many people does Lake St John Waterworks District 1 serve?
Lake St John Waterworks District 1 reports serving 2,067 people through 689 service connections in Concordia Parish County, Louisiana.
Where does Lake St John Waterworks District 1 get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Lake St John Waterworks District 1 have any drinking water violations?
Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in October 2023. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Lake St John Waterworks District 1's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in October 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the LA state drinking water program.
Where can I find Lake St John Waterworks District 1's water quality report?
As a community water system, Lake St John Waterworks District 1 must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Concordia Parish County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Concordia Waterworks District 1 | Concordia Parish | 6,921 | Community | Groundwater |
| Town of Vidalia Water System | Concordia Parish | 6,354 | Community | Groundwater |
| Monterey Rural Water System Inc. | Concordia Parish | 5,250 | Community | Groundwater |
| Town of Ferriday Water System | Concordia Parish | 3,816 | Community | Groundwater |
| Village of Clayton Water System | Concordia Parish | 723 | Community | Groundwater |
| Village of Ridgecrest Water Supply | Concordia Parish | 684 | Community | Purchased groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Lake St John Waterworks District 1, PWSID LA1029006, Louisiana”, https://aquacensus.com/water-systems/louisiana/lake-st-john-waterworks-district-1-la1029006 (data as of October 1, 2026).